OLEDNet has reported on an event held at COEX in Seoul, Korea, when Kim, Seok-Soon, CEO of Unijet Ltd who claimed that ink-jet printing technology can be used to create over 550 ppi RGB OLEDs in small and medium panel applications. The use of sub-pixel addressing means that the 550 ppi of current AMOLEDs is, effectively, 400ppi on a physical equivalent basis.
The site quotes Kim as saying that
“In 2012, single droplet measurement technology showed 2.5% or less of volume accuracy, which was, however, insufficient for RGB printing. In 2017, the laser droplet measurement technology enabled the discharge volume control less than 0.1 μm and the real-time internal pressure control reduced the volume accuracy by less than 0.1%.
Kim is reported to have said that the development also depends on the quality of the inks that are developed, which need to have high solvent purity and expects some mass production by 2020 when suitable inks are available.
Analyst Comment
As Unijet points out on its website, for display applications, the uniformity has to be very high and the company rates this as ±2%. That has been one of the biggest challenge for inkjet over the years. (BR)
